1. VA Nebraska‐Western Iowa Health Care System and University of Nebraska Medical Center Omaha
2. VA Nebraska‐Western Iowa Health Care System and University of Nebraska Medical Center, Omaha, and Forward, The National Databank for Rheumatic Diseases Wichita KS
3. VA Portland Health Care System and Oregon Health & Science University Portland OR
4. Corporal Michael C. Crescenz VA Medical Center and University of Pennsylvania Philadelphia PA